The Pale-legged Warbler is an Andean species found from central Peru to NW Argentina. It is a relatively non-descript warbler, yellow below greenish above but showing a bold dark eyeline, a wide bright yellow supercilium and dark olive crown. The legs are not black, but often not pale enough to be the feature that gives the bird its name! It is found in montane forests at mid elevations, from 2000 to 2800m. While visually this species resembles the Citrine Warbler (B. luteoviridis), it is actually distantly related to it and the Pale-legged is the sister species to the Black-crested Warbler (B. nigrocristatus). In fact, Pale-legged is essentially a paler, duller more southern offshoot of the Black-crested. The song of the Pale-legged Warbler is a series of quickly delivered chip notes that accelerate and move up the scale before slowing and descending the scale. The song is slower and richer than the very quick trilled and less organized song of the Citrine Warbler. On average in Bolivia the Pale-legged Warbler is found at lower elevations than the visually similar Citrine Warbler, but also note that the Citrine has a bright yellow supercilium before the eye, and it fades to nearly nothing behind the eye while on the Pale-legged the dark eyeline is more noticeable and the supercilium is bold well behind the eye.